when we creating a new page, there is a dropdown list for "Page Template", where can i create a new Page template page?

Thanks you, I have find it. see as following.

I want to define the container for the module, but i do not what kind of value should be put the this tag, could you give a sample?

<containersrc>
</containersrc>

 Thanks

<portal version="3.0">
  <description>Default page template with just an HTML/Text module</description>
  <tabs>
    <tab>
      <panes>
        <pane>
          <name>ContentPane</name>
          <modules>
            <module>
              <title>Enter Title</title>
              <cachetime>0</cachetime>
              <alignment>left</alignment>
              <color />
              <border />
              <iconfile />
              <alltabs>false</alltabs>
              <visibility>Maximized</visibility>
              <header />
              <footer />
              <startdate>0001-01-01T00:00:00.0000000+11:00</startdate>
              <enddate>0001-01-01T00:00:00.0000000+11:00</enddate>
              <containersrc>
              </containersrc>
              <displaytitle>true</displaytitle>
              <displayprint>true</displayprint>
              <displaysyndicate>false</displaysyndicate>
              <inheritviewpermissions>true</inheritviewpermissions>
              <modulepermissions>
                <permission>
                  <permissioncode>SYSTEM_MODULE_DEFINITION</permissioncode>
                  <permissionkey>EDIT</permissionkey>
                  <rolename>Administrators</rolename>
                  <allowaccess>true</allowaccess>
                </permission>
              </modulepermissions>
              <definition>Text/HTML</definition>
            </module>
          </modules>
        </pane>
      </panes>
    </tab>
  </tabs>
</portal>